The Member of the Wedding Lesson Plan

Why can't F. Jasmine and the soldier talk together? Why is their conversation like "two connections not going together"? What can you conclude from F. Jasmine's statement that the soldier's conversation is like "double talk" with an "undertone she didn't understand"?

You can tell from these comments that F. Jasmine is totally over head and inexperienced. She cannot understand him because he speaks as an adult, with adult desires, and she is still a child. He is interested in her for sex, while she has no conception of his motives, so they talk past each other in an absurd way.

When F. Jasmine reluctantly goes upstairs with the soldier, what does she think is about to...